An ampere-turn is defined as the magnetizing force produced by a current of one ampere flowing through a coil of how many turns?

An ampere-turn is defined as the magnetizing force produced by a current of one ampere flowing through a coil of how many turns?

• A. One turn
• B. Two turns
• C. Ten turns
• D. Hundred turns

Answer: (A)

Ampere-turns quantify magnetomotive force as the product of current and the number of turns in a coil (NI). With a current of one ampere, the magnetizing force equals the number of turns in the coil, so one ampere through one turn yields 1 ampere-turn. In other words, the coil must have one turn to produce one ampere-turn. If you had more turns with the same 1 A, you’d get more ampere-turns (for example, 1 A through 2 turns would be 2 ampere-turns).

Ampere-turns quantify magnetomotive force as the product of current and the number of turns in a coil (NI). With a current of one ampere, the magnetizing force equals the number of turns in the coil, so one ampere through one turn yields 1 ampere-turn. In other words, the coil must have one turn to produce one ampere-turn. If you had more turns with the same 1 A, you’d get more ampere-turns (for example, 1 A through 2 turns would be 2 ampere-turns).